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Which risk increases when enriched Uranium-235 fuel rods in a nuclear reactor experience excessive neutron flux?

A)Uncontrolled chain fission reaction occurs
B)Moderator effectiveness paradoxically intensifies
C)Fuel rod thermal fatigue marginally diminishes
D)Neutron absorption cross-section gets enhanced

💡 Explanation

An uncontrolled chain fission reaction starts because increased flux escalates the fission rate beyond coolant capacity, therefore meltdown is more likely, rather than increased moderator effectiveness limiting fission events.

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